Violence against republicans in the south caused the federal government to:

a: increase the number of troops in major cities

b: repeal constitutional amendments passed during the war

c: accept democratic control of state governments

d: postpone elections for federal offices

A- Increase the number of troops in major cities 

Just think, why was it effective? -it appeled to critics because it was written well, that made it noticeable to the public including the white population-it was also recognizable to the african americans because it was about their heritage.-it was powerful just keep finding more points and elaborate on them. message me if you need more